Abrasion and resistance reducing device for downhole tool

Abstract

The utility model discloses a wear and drag reduction device for downhole tools, which comprises a power assembly, a driving assembly and a valve body assembly, the power output end of the power assembly is connected with the driving input end of the driving assembly, the driving output end of the driving assembly is connected with the valve body assembly, and the valve body assembly is connected with the valve body assembly. The input end of the power assembly is connected with a downhole tool, and an outlet of the valve body assembly is connected with another downhole tool. The utility model has the characteristics of high concentricity, low rotating speed, high pressure difference and high vibration amplitude, solves the problems of complex structure, unobvious wear-reducing and resistance-reducing effect, short service life, frequent replacement and maintenance, increase of the cost and workload of drilling engineering and the like of a wear-reducing and resistance-reducing tool in the prior art, improves the drilling efficiency and reduces the construction cost. And the drilling time is greatly shortened.

Description

Technical Field

[0001] The utility model relates to an auxiliary device for oil drilling, in particular to a friction reduction and drag reduction device for downhole tools. Background Technique

[0002] With the wide application of highly deviated wells and horizontal wells in the oil and gas industry, especially the continuous increase in the drilling depth of the horizontal section, the friction problem between the drill string and the drill tool string and the inner wall of the wellbore or casing has become increasingly prominent. This friction seriously affects the drilling speed and sometimes even causes the pipe string to bend or lock. To solve these problems, many companies at home and abroad have developed friction reduction and drag reduction tools with different principles, aiming to reduce the friction between the drill tool and the wellbore wall and improve the drilling efficiency.

[0003] The currently commonly used friction reduction and drag reduction tools have the following problems: First, most of these tools require axial movement of the pipe string and have complex structures, which bring certain difficulties to the operation; second, the friction reduction and drag reduction effect is not obvious and cannot achieve the expected effect of reducing the frictional resistance; third, due to the complex structure, the service life of these tools is usually short, and they need to be frequently replaced and repaired, increasing the cost and workload of the drilling project.

[0004] To solve these problems, it is necessary to further improve the design and manufacture of the friction reduction and drag reduction tools, simplify the structure, reduce the tool components, and improve the stability and reliability of the tools. The research and testing of the friction reduction and drag reduction tools can be strengthened to ensure that their effects and performances in actual applications meet the expectations.

[0005] In summary, aiming at the problems existing in the currently commonly used friction reduction and drag reduction tools, further research and improvement are needed to improve the effect and service life of the tools, so as to better meet the needs of the oil and gas drilling project. Summary of the Invention

[0006] The purpose of the utility model is to provide a friction reduction and drag reduction device for downhole tools.

[0007] To achieve the above purpose, the utility model is implemented according to the following technical scheme:

[0008] The utility model includes a power component, a drive component and a valve body component. The power output end of the power component is connected to the drive input end of the drive component, the drive output end of the drive component is connected to the valve body component, the input end of the power component is connected to the downhole tool, and the outlet of the valve body component is connected to another downhole tool.

[0009] The power assembly includes an upper joint, a drive cylinder, a piston, an anti-rotation cylinder, a housing, and a first bearing. The drive cylinder is located within the upper joint and is capable of sliding. The piston is located within the drive cylinder and is capable of sliding. One end of the upper joint is connected to a downhole tool, and the other end of the upper joint is connected to one end of the housing through the anti-rotation cylinder. The other end of the housing is rotationally connected to the drive assembly through the first bearing.

[0010] The drive assembly includes a drive pin, a second bearing, a rotating cylinder, a spring, a third bearing, a double male joint, and a central shaft. The outer wall of the drive cylinder is provided with continuous inclined grooves. One end of the rotating cylinder is rotationally connected to the housing through the first bearing. One end of the drive pin is fixedly connected to the inner wall of the rotating cylinder, and the other end of the drive pin is located within the groove on the outer wall of the drive cylinder and is capable of sliding. The rotating cylinder is rotationally connected to the central shaft through the second bearing. The spring is sleeved outside the central shaft, and both ends of the spring are located between the drive cylinder and the rotating cylinder. One end of the double male joint is rotationally connected to the other end of the housing through the third bearing, and the other end of the central shaft is connected to the valve body assembly.

[0011] The valve body assembly includes a transmission shaft, a second housing, a movable valve, a fixed valve, and a lower joint. The central shaft is fixedly connected to one end of the transmission shaft. The other end of the transmission shaft is connected to the fixed valve through the movable valve. The other end of the fixed valve is connected to the lower joint, and the other end of the lower joint is connected to another downhole tool. Both ends of the second housing are connected between the double male joint and the lower joint.

[0012] The beneficial effects of the present utility model are as follows:

[0013] The present utility model is a wear reduction and drag reduction device for downhole tools. Compared with the prior art, the present utility model has the characteristics of high concentricity, low rotational speed, high pressure difference, and high vibration amplitude, solving the problems in the prior art such as complex structures of wear reduction and drag reduction tools, unobvious wear reduction and drag reduction effects, relatively short service lives, frequent replacement and maintenance, increased costs and workloads of drilling engineering, etc., improving the drilling efficiency and greatly shortening the drilling time. Description of the Drawings

[0014] Figure 1 is a schematic cross-sectional structure diagram of the present utility model;

[0015] Figure 2 is a schematic partial structure diagram of the drive cylinder of the present utility model;

[0016] Figure 3 is a schematic structure diagram when the piston of the present utility model contacts the central shaft;

[0017] Figure 4 This is a schematic structural diagram when the drive cylinder of the present utility model disengages from the piston.

[0018] In the figure: upper joint 1, drive cylinder 2, piston 3, anti-rotation cylinder 4, outer shell 5, first bearing 6, drive pin 7, second bearing 8, rotating cylinder 9, spring 10, third bearing 11, double male joint 12, central shaft 13, transmission shaft 14, second outer shell 15, movable valve 16, fixed valve 17, lower joint 18. Specific embodiments

[0019] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of this utility model are used to explain the present utility model, but do not limit the present utility model.

[0020] As Figures 1-4 shown: The present utility model includes a power assembly, a drive assembly, and a valve body assembly. The power output end of the power assembly is connected to the drive input end of the drive assembly. The drive output end of the drive assembly is connected to the valve body assembly. The input end of the power assembly is connected to a downhole tool, and the outlet of the valve body assembly is connected to another downhole tool.

[0021] The power assembly includes an upper joint 1, a drive cylinder 2, a piston 3, an anti-rotation cylinder 4, an outer shell 5, and a first bearing 6. The drive cylinder 2 is located inside the upper joint 1 and can slide. The piston 3 is located inside the drive cylinder 2 and can slide. One end of the upper joint 1 is connected to a downhole tool, and the other end of the upper joint 1 is connected to one end of the outer shell 5 through the anti-rotation cylinder 4. The other end of the outer shell 5 is rotationally connected to the drive assembly through the first bearing 6.

[0022] The drive assembly includes a drive pin 7, a second bearing 8, a rotating cylinder 9, a spring 10, a third bearing 11, a double male joint 12, and a central shaft 13. The outer wall of the drive cylinder 2 is provided with continuous inclined grooves. One end of the rotating cylinder 9 is rotationally connected to the outer shell 5 through the first bearing 6. One end of the drive pin 7 is fixedly connected to the inner wall of the rotating cylinder 9. The other end of the drive pin 7 is located in the groove on the outer wall of the drive cylinder 2 and can slide. The rotating cylinder 9 is rotationally connected to the central shaft 13 through the second bearing 8. The spring 10 is sleeved outside the central shaft 13, and both ends of the spring 10 are located between the drive cylinder 2 and the rotating cylinder 9. One end of the double male joint 12 is rotationally connected to the other end of the outer shell 5 through the third bearing 11, and the other end of the central shaft 13 is connected to the valve body assembly.

[0023] The valve body assembly includes a drive shaft 14, a second housing 15, a movable valve 16, a fixed valve 17, and a lower joint 18. One end of the central shaft 13 is fixedly connected to one end of the drive shaft 14. The other end of the drive shaft 14 is connected to the fixed valve 17 through the movable valve 16. The other end of the fixed valve 17 is connected to the lower joint 18. The other end of the lower joint 18 is connected to another downhole tool. Both ends of the second housing 15 are connected between the double male joint 12 and the lower joint 18.

[0024] The working principle of the present invention is as follows:

[0025] The upper joint 1 is connected to the housing 5 by threads. The housing 5 is connected to the anti-rotation cylinder 4 by splines. The drive cylinder 2 and the piston 3 are connected together. The fluid generates throttling and pushes the drive cylinder 2 and the piston 3 to move downward together. When the piston 3 moves to the end face of the central shaft 13, it cannot move. Under the action of the fluid and inertia force, the drive cylinder 2 still moves downward and continuously compresses the spring 10. As the drive cylinder 2 still moves downward until it separates from the piston 3. During this process, the rotating cylinder 9 rotates through the reaction force generated by the sliding of the drive pin 7 in the cam groove of the drive cylinder 2. At this time, the flow cross-section becomes larger, and the fluid pressure on the drive cylinder 2 decreases. The spring force is greater than the force acting on the drive cylinder 2, and the drive cylinder 2 is pushed upward by the spring force until the drive cylinder 2 and the piston 3 are combined together, forming a cycle. The drive cylinder 2, the piston 3, the anti-rotation cylinder 4, the drive pin 7, and the rotating cylinder 9 form a power system to provide rotational power. The rotating cylinder 9 is connected to the drive shaft 14 by threads to transmit the rotational power to the movable valve 16. The movable valve 16 and the fixed valve 17 form different flow cross-sections through relative rotation to generate different fluid pressure differences to generate axial impact force. The movable valve 16 makes a relative rotational movement with respect to the fixed valve 17 and forms a fluid passage. The fluid such as water enters the tool through the inner flow passage of the upper joint 1 and exits the tool through the inner flow passage of the lower joint 18. Since the drive cylinder 2, the anti-rotation cylinder 4, the housing 5, the bearing 6, the drive pin 7, the bearing 8, and the rotating cylinder 9 are used as power transmission components, and the rotating cylinder 9 and the lower joint 18 are used as fluid discharge components. Therefore, the present invention has the characteristics that the rotating cylinder and the housing rotate coaxially, and at the same time, an oscillating force is generated by the change of the flow cross-section of the movable valve and the fixed valve, with low rotational speed, high pressure difference, and high vibration amplitude. It solves the problems of complex structure of the existing anti-friction and drag reduction tools and unobvious anti-friction and drag reduction effects, improves the drilling efficiency, and greatly shortens the drilling time.

[0026] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present invention, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A friction and drag reducing device for downhole tools, characterized in that: It comprises a power assembly, a drive assembly and a valve body assembly, wherein the power output end of the power assembly is connected to the drive input end of the drive assembly, the drive output end of the drive assembly is connected to the valve body assembly, the input end of the power assembly is connected to a downhole tool, and the outlet of the valve body assembly is connected to another downhole tool; The power assembly comprises an upper joint (1), a driving cylinder (2), a piston (3), an anti-rotation cylinder (4), an outer shell (5), and a first bearing (6); the driving cylinder (2) is located in the upper joint (1) and is capable of sliding; the piston (3) is located in the driving cylinder (2) and is capable of sliding; one end of the upper joint (1) is connected to a downhole tool; the other end of the upper joint (1) is connected to one end of the outer shell (5) via the anti-rotation cylinder (4); the other end of the outer shell (5) is rotationally connected to the driving assembly via the first bearing (6).

2. The friction and drag reducing device for downhole tools according to claim 1, characterized in that: The driving assembly comprises a driving pin (7), a second bearing (8), a rotating cylinder (9), a spring (10), a third bearing (11), a double male joint (12), and a central shaft (13). The outer wall of the driving cylinder (2) is provided with a continuous oblique groove. One end of the rotating cylinder (9) is rotatably connected to the outer shell (5) through the first bearing (6). One end of the driving pin (7) is fixedly connected to the inner wall of the rotating cylinder (9). The other end of the driving pin (7) is located in the groove of the outer wall of the driving cylinder (2) and is capable of sliding. The rotating cylinder (9) is rotatably connected to the central shaft (13) through the second bearing (8). The spring (10) is sleeved outside the central shaft (13). Both ends of the spring (10) are located between the driving cylinder (2) and the rotating cylinder (9). One end of the double male joint (12) is rotatably connected to the other end of the outer shell (5) through the third bearing (11). The other end of the central shaft (13) is connected to the valve body assembly.

3. The friction and drag reducing device for downhole tools according to claim 2, characterized in that: The valve body assembly comprises a transmission shaft (14), a second housing (15), a movable valve (16), a fixed valve (17), and a lower joint (18); the central shaft (13) is fixedly connected to one end of the transmission shaft (14); the other end of the transmission shaft (14) is connected to the fixed valve (17) through the movable valve (16); the other end of the fixed valve (17) is connected to the lower joint (18); the other end of the lower joint (18) is connected to another downhole tool; and the two ends of the second housing (15) are connected between the double male joint (12) and the lower joint (18).

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